Support for Metrics and Prometheus.

middlewares/prometheus_test.go

@@ -0,0 +1,47 @@
+package middlewares
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/codegangsta/negroni"
+	"github.com/containous/traefik/types"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+func TestPrometheus(t *testing.T) {
+	recorder := httptest.NewRecorder()
+
+	n := negroni.New()
+	metricsMiddlewareBackend := NewMetricsWrapper(NewPrometheus("test", &types.Prometheus{}))
+	n.Use(metricsMiddlewareBackend)
+	r := http.NewServeMux()
+	r.Handle("/metrics", promhttp.Handler())
+	r.HandleFunc(`/ok`, func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintln(w, "ok")
+	})
+	n.UseHandler(r)
+
+	req1, err := http.NewRequest("GET", "http://localhost:3000/ok", nil)
+	if err != nil {
+		t.Error(err)
+	}
+	req2, err := http.NewRequest("GET", "http://localhost:3000/metrics", nil)
+	if err != nil {
+		t.Error(err)
+	}
+
+	n.ServeHTTP(recorder, req1)
+	n.ServeHTTP(recorder, req2)
+	body := recorder.Body.String()
+	if !strings.Contains(body, reqsName) {
+		t.Errorf("body does not contain request total entry '%s'", reqsName)
+	}
+	if !strings.Contains(body, latencyName) {
+		t.Errorf("body does not contain request duration entry '%s'", reqsName)
+	}
+}